Rinko's first love was during her middle school years. The object of her affection was Shiori, a female university student who worked as a tutor. However, Shiori had already decided to get married right after graduating from university. Rinko's first love ended without her confessing her feelings. Two years later, Rinko, now a high school student, has completely changed her figure and reunites with the now larger Shiori. When she learns that Shiori's marriage fell through due to her gaining weight and that she is still single, Rinko's suppressed feelings overflow――. Knowing that her feelings may never be realized, Rinko decides to support Shiori's diet in order to stay by her side. What will happen to Shiori's figure and Rinko's love story...?